mineral
Amazonite
Microcline feldspar, KAlSi3O8
Hardness of 6 on the Mohs scale, pale green to blue-green color, vitreous to pearly luster, monoclinic crystal system, good cleavage in two directions at nearly 90 degrees, specific gravity of 2.56-2.58.
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Physical properties
Hardness of 6 on the Mohs scale, pale green to blue-green color, vitreous to pearly luster, monoclinic crystal system, good cleavage in two directions at nearly 90 degrees, specific gravity of 2.56-2.58.
Formation & geological history
Forms in pegmatites and granitic rocks, often associated with hydrothermal veins, cooling slowly from magma rich in potassium and water over millions of years.
Uses & applications
Used primarily as an ornamental stone, for tumbled stones, cabochons in jewelry, and decorative carvings.
Geological facts
The vibrant blue-green color of amazonite was traditionally thought to be caused by copper, but modern studies show it is due to small amounts of lead and water in the feldspar structure.
Field identification & locations
Can be identified by its distinctive grid-like or mottled white streaks and characteristic turquoise-green color. Found worldwide including in the United States, Russia, Brazil, and Madagascar.
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Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral